Indexing mechanism



Oct. 4 1927. 1,644,540

A. J. oTT ET- AL INDEXING MECHANISM Filed May 18, 1925 5 Sheets-Sheet 1 Alba/[M011 1,644,540 Oct. 4,1927. I A. J. OTT 3. AL

INDEXING MECHANISM Filed May-18, 1925 v v 1 s Sheets-Sheet 2 Snoentow Oct'. 4

1927 A. J. OTT ET AL INDEXING MECHANISM Filed May 18, 1925 5 Sheets-Sheet 5 & M

Patented Oct. 4, 1927.

UNITED STATES 1,644,540 PATENT OFFICE.

ALBERT J. OTT AND CONRAD L.'OTT, OF DETROIT, MICHIGAN, ASSIGNOBS TO AMERI- CAN GRINDER COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

mnnxme MECHANISM.

Application filed May 18,

relative thereto, the carriage having transversely mounted thereon a work spindle oscillated by means of flexible tapes. The indexing mechanism is arranged between the work spindle and the oscillating mechanism 1 therefor, and comprises a peripherally notched index plate secured to the spindle and normally driven by means of the flexible tapes through an index pawl engaging one of the notches of the late. The indexing 2 is accomplished by withdrawing the pawl from the index plate and permitting a relative movement of the parts until the pawl engages the next succeeding notch.

The machine as thus far described is similar to other machines of'the prior art, such,

for example, as that described in our copending application Serial Number 615,583, filed January 29, 1923. The novelty in our new invention resides principally in the mechanism for imparting the relative-movement to the index plate and pawl.

One of the objects of the invention is the .provision of an indexing mechanism capable of completing its indexing movement in a very short interval of time whereby the machine will have a greater portion of its cycle of o eration devoted to the actual grinding of t1eWork. Another object of the invention is to provide an indexing mechanism .whic'h can be actuated independently of the reciprocating carriage. Still another object is to provide a power lifted: index pawl operated independently of the flexible tapes or other oscillatingmeans for the spindle, whereby the tapes are relieved from any stresses incident to the indexing movement.

' A further object is the provision of means.

for inde endently rotating the index late andlwor spindle during the period 0 indexing in the opposite direction from their,

normal movement whereby a smaller portion of the c cle is re uired for indexing. A E still further object is the provision of a tripmechanism operating in timed relation to onthe line 5-5 of 1925. Serial No. 31,152.

themain drive shaft of the machine, this tripmechanism servin to positively withdraw the index pawlrom the index plate and at substantially the same time to cause the driving of the index plateinthe reverse direction. f

These and other objects are attained by the novel'construction hereinafter more fully described and illustrated inthe accompanyin drawings wherein: I

igure 1 is a fragmentary plan view of a grinding machine rovided with the im} proved indexing mec anism;

Figure 2 is a rear view thereof partly in section; v,

Figure 3 is a transverse section taken mainly on the line 3-3 of Figure 1;

Figure 4 is a fragmentary View somewhat similar to Figure 2 showing the-index plate and index pawl;

Figure 5 is an enlar ed sectional plan view igure 2;

Figure 6 is a side view ofthe trip mechanism on an enlarged scale;

Figures 7 and 8 are fragmentary views at right angles to Figure 6 showing the levers 69 and 86.

The grinding machine to which our in dexing mechanism is applied as illustrated in the drawings, comprises in general a frame 10 having the longitudinal guide wa s 11 on which the carriage 12 reciprocates, t e latterbeing driven through a depending arm 13 carrying a roller 14 engaging the cam slot 15 of a cam drum 16. The drum is mounted on a shaft 17 journaled in the frame and driven by suitable means (not shown). Mounted transversely on the carriage 12 is ahollow spindle 18 journaled in the tapered bearings 19 and 20 and supporting at one end the arbor 21 on which the gear 22 is suitably clamped. A hub 23 is secured to the other end of the spindle 18 and carries a notched index plate 24. 25 is a rotatable.

index housing surrounding the index plate 24 and rotatably. mounted on the spindle 18 I by means of a projecting'sleeve 26. inserted between the tapered bearing 20, and they] cylindrical portion 27 of the spindle. An index cover plate 28 secured to the index.

housing 25 is rotatably mounted on the outer 105 end 29 of the spindle and carries acylinder 30 around which are wrapped: the fiexible steel tapes 31-. These tapes extend in opposite directions and are anchored upon an ad'ustable table 32, the latter being longitudinally slidable upon the guide Ways 33 ulpon an upwardly extending portion 34 of t e 10. s.

The index housing is normally connected to the index plate 24 by means of an index pawl 35%the latter being carried by g le radially in the guide Ways 87 :of'the index housing. For normally maintaining the pawl 35 in en agement with theindex plate there is a spr ng 38 having one end abutting a shoulder 39 in the index I housingand the other end bearing against 8016!. arm40 projecting laterally from the slide the mechaiiism as thusfar described,

,it be ap. arent that rotation of the cam :drum 16 W1 impart a reciprocation to the plished dur' the'portion of the cycle when thelgear 22 ing rolled out of engagement with the grinding-wheel'fl. For this pur pose there is employed a trip mechanism actuated. by a. rotatable cam 42 driven in timedjrelation to the drum cam 16. The f mechanism for rotating the cam 42 com rises a gear 43 keyed to the shaft 17 which rives an idler gear 44, the latter being in mesh driving a gear 45 on a countershaft 46, which in is journaled in bearings 47 and 48 on the frame and extends through the lower portion of the stationary index housing 49 9n the carriage 12. A sleeve 50 is journaled bearings. 51 in the lower portion of the m rhonsmfi 49 and is adapted, to slide on the aft while being at all times non-rotatably secured thereto by the key 52 engaging ,the slot 53 in the shaft. The housing 49 a mounted in the upper portion thereof a 54 carrying rocket, 55. 56 is a chain passing aroundat one end thereof a e sprocket 55, the idler sprocket 57 and a rocket 58, the latter being secured q tothe seeve 50.;The cam 42 is fixedly mounted on the-shaft '54 and is, therefore,- driven in timed'relation to the cam drum v16, the gearing being such that the cams both ..-rotate at the same s eed. 59 is a clutch sleeved upon the sha t 54 and havingthe A bevel meshes with a bevel clutch teeth 60 on one face thereof adapted ge corresponding clutch teeth 61 on I the jaoent faceofthecam42. Thisclutch is normally disengaged from the'cam 42. gear 62 secured to the clutch 59 gear 63 on a shaft 64 journaled parallel to the spindle 18. The

shaft carries a spur gear 65 meshing with an idler 66 which, 'inturn, meshes with a gear 67 fixedly secured on the spindle 18.

The trip mechanism comprises a series of levers rockable upon a shaft 68 exteiiding transversely of the stationar index housing. On'e lever 69 has two arms epending therefrom, designated as 70 and 71 respectively.

The arm 71 is slotted at 72 and has inserted therein a cam lever 73 rigidly attached thereto by the machine screws 74 and having at it lower end the inclined cam surface 75. This cam surface 75 is so arranged as to bein the path of a lug 76 on the cam 42, this lug having the tapering cam surface 77 adapted to engage the cam surface 75 and thereby cause the lever 69 to be rocked about the pivot shaft 68.

The other arm 70 of the lever 69 carries at its lower end a roller 7 8 which is adapted to enter a segmental slot 79 in a segment 80 attached tothe slide 36.. The arrangement of the parts is such that the segment 80 which is carried b the rotatable index housing 25 engages t e roller 78 just prior to the engagement of the cam lug 76 with the cam surface 75 so that when the latter en-- vided with a lateral extension 85, the.function of which is hereinafter explained. A second lever 86 is mounted on'the shaft 68 and is provided with a depending arm 87 having a slot 88 therein in which is inserted a second cam lever 89.- The latter isadjacent the cam lever 73 and provided with a similar inclined surface 90 set slightly below the cam surface 75 so as to be actuated by the cam lug76 slightly later than the cam lever 73. The lever 86 is also pro- 'vided with an arm 91, the latter being, pivotally connected by a pin 92 to a clutch lever. i Q

93. Archer 94. at the lower end of the clutch lever 93 engages annular roove 95 in the clutch 59. 96 is a rod an aperture 97 in the clutch lever 93. A

68 thereby increasing the tension of the hreadedl engaging the arm 87 and extending through spring 98 is sleeved upon the rod 96 and 1 has one end bearing against the clutch lever 93, the. other end abutting the collar 99. Thus, when the cam dog 76 trips the cam lever 89, the lever 86 is rocked on the shaft! spring 98 and resiliently urging the clutch lever 93 to shift the clutch59. In order to revent the shifting of the clutchlever 93 fore the index pawl 35 is disengaged from the notched index plate, the lever 93 is pro-' vided with an adjustable stop 100 engaging the arm 84 ofthe lever 69.

The clutch 59 is preferably provided with only three clutch teeth. for engaging the corresponding teeth on the cam 42, these three teeth being preferably adjacent so as to eliminate any possibility of inaccurate spacing. 7

The operation of the indexing mechanism is as follows: The index plate 24 and in-,

dex housing 25 are normally oscillated in a counter-clockwise direction inFigure 2 as the gear is being withdrawn from contact with the grinder wheel. The settingof the cam dog 76 is such that it contacts with the the index pawl from the index plate 24.

The cam dog 76 strikes the second cam lever. 89 an instant later, thereby rocking the second lever 86 which through the medium of..

the'spring 98 shifts the clutch lever 93 and engages the clutch teeth'60 with teeth 61 on the rotating cam 42. The spindle 18 and index plate 24, are, therefore, driven by means of the gears 62, 63, 65, 66 and 67, this causin the index plate to be rotated in a clockwise direction. After the index plate has begun its reverse rotation the cam dog 76.rides off the cam levers 73 and. 89, but the index awl 35 now rides on the periphe of the in ex plate 24 until the next succee ing ,notch is reached when it is resiliently urged inward by the spring 38. This permits the lever 69 to resumeits normal posi tion because of the tension of the spring 83 whereupon the arm 84 acting through the stop-100 disengages the clutch 59 and allows; the index late 24 to once more be driven by theind zex pawl 35.

What we claim asour invention is 2-- 1, In a machine of the class described, a rotatable spindle,.means for oscillating the same, and means for rotating said s indle oppositely to said oscillating means uring a portion of the cycle to effect an indexing movement. q

2. In a machine of the class described,

" a rotatable spindle,.tan' oscillating member normally connected to said spindle for driv- Ice ing the latter, means for'disconnecting said oscillating, member from said spindle during the oscillationthereofin one direction,

and means independent of said oscillating.

member for rotatin said spindle in the opposite "direction 1w ile disconnected from said oscillating member.

3. In a'machine of. the class described, a

connecting said clutch to sai said spindle is rotated oppositely from said rotatable spindle, a notched plate secured thereto, an oscillating member adjacent said plate, an index pawl on-said member normally engaging said plate, means for withdrawing said pawl from said plate, and means for independently rotatin said spin- 7 dle oppositely to the rotation or said oscil-' lating-member to effect an indexing move-' ment relative to said oscillating :member while said pawl is .withdrawn.

4. In a machine of the class described,"a rotatable spindle, an oscillating member, a device normally connecting said spindle and said oscillating member, and means mounted independently of said oscillating-member for disconnecting'said spindle from said device.

5.In a machine; of" the class described a rotatable spindle, an oscillating member, a

device normally connecting'said spindle and oscillating member, a rotatable shaft mounted independently of said oscillating member,

means for rotating said shaft, a cam on said 7 shaft and mechanism operated by said cam for withdrawin said pawl.

' 6. In a machine of the class described, a

rotatable spindle, an oscillatin member, a device normally connecting'sai spindle and oscillating member, a rotatable shaft mount ed independentl of said oscillating member, means for riving said shaft,a cam on.

oscillating member.

said pawl and shaft whereby .said shaft, a clutch normally disconnected from said shaft, gearing-between said clutch ice 7. Ina machine of the class described, a

reciprocating carriage, a rotatable spindle journaled thereon, an oscillating member also journaled on said carriage, means for oscillating said member in timed relation to the reciprocation of said carriage, an index plate, a cooperating index pawl normally engaging said plate, one of said cooperating members bein carried by .said oscillating member and t e other by said rotating spindle, means for withdrawing said index pawl from said plate, and means for rotating said spindle oppositely. to said oscillat-' ing memberwhile said pawl is withdrawn.

8. In a machine of'the classrdescribed a frame, acarriage slidable thereon, means or reciprocating said carriage, a rotatable spindle journaled on said carriage, an oscillating. member also journaled on said carsaid pawl being radially s Ida la in sai riage, an index platesecured to said spindle, an index pawl normally enga In said plate lating member, tapes wrapped around said oscillating member,-a cylinder on said oscil: I j

v to the rotation of the first cooperating member.

DISCLAIMER.

1,644,540.-A Zbe'r't J. Otzf and Conrad L. 0232?, Detroit, Mich. INDEXING MECHANISM. Patent dated October 4, 1927. Disclaimer filed May 14, 1928, by the assignee, .flmer'ican Grinder Company. i

' Hereby enter this disclaimer to the claims of said Letters Patent which are in the following words, to wit:

1. In a machine of the class described, a rotatable spindle, means for oscillating the same, and means for rotating said spindleoppositely to said oscillating means during a portion of the cycle to effect an indexing movement? 3. In a machine of the class described, a rotatable spindle, a notched plate securedfi-hereto, an oscillating member adjacent said plate, an index pawl on said member normally engaging said plate, means for withdrawing said pawl from said plate, and means for independently rotating said spindle oppositely to the rotation of said oscillating member to efiect an indexing movement relative to said oscillating member while said pawl is withdrawn.

4. In a machine of the class described, a rotatable spindle, an oscillating member, a device normally connecting said spindle and said oscillatingmember, and means mounted independently of said oscillating member for disconnecting said spindle from said device.

13. In a machine of the class described, a rotatable member, an oscillatory'member, means for oscillating said oscillatory member, means for intermittently connecting and disconnecting said oscillatory member to said rotatable member, and means for rotating said rotatable member in a direction opposite to the rotation of said oscillatory member during the interval when said rotatable member is disconnected from said oscillatory member. v

14. In a machine of the class described, an indexing plate, a cooperating index plunger, means for oscillating one of said cooperating members, means for withdrawing said plunger from said plate, and means operating While said plunger is withdrawn for rotating the other of said cooperating members in a direction opposite 15. In a machine of the class described, a non-oscillatory frame, a rotatable spindle journaled in said frame, an oscillatory member also journaled in said frame, means normally connecting said oscillatory member to said rotatable spindle, means for disconnecting said spindle from said oscillatory member, and means 0 rating While said oscillatory member is disconnected for rotating said spindle re ative to said non-oscillatory frame in a direction opposite to the rotation of said oscillatory member relative to said frame.

[Ozficz'al Gazette May 29, 1928.] 

